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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1b5c7d474510321d3be9ad7ccde62ec4c766f4ef6e021e8af859b15f024495' 
  AND token = 'owFQqzvo4HmdJNdw2DS2APX8s1262r4haa4kvljmcG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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