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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c105b54c9d74693090046b3199b55c50bdbb3f3fc037a99c90cfd137692b28cc' 
  AND token = '5HKGqCAcCgN51ZviHHz/PdQgAfVRPwZwBwozi79X6dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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