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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d7cf36b28f5dee8a3620894963ce4bd7d3307835686f16f138b1ba2c2ffe96' 
  AND token = '3YwSYaU1tyTds2kitzQ7QigyPmy1NvJY+Dqj9caytnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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