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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fde62aad2137b2a2dfde3fd2e7a403d77a0a458177d25a1af8ff9ae6071272' 
  AND token = '0cvtJWviy4k2yogUgvPcD7HMeJEU87FKROvoOIE93bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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