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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f16be3b54baf92e11c6d80b7a8a3732743ac9004fe84de583f46f521a1ad9be' 
  AND token = 'fi8b0j8XCgPCPg5JdJ/cyt7/KADtP4C52N2Nv6FNWQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}