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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f057018043c7bbf2467af4032c4bff0f1f254d87fa3027be6d70465fa597d3b' 
  AND token = '1Ns8d+KvCo9WY2TUv21rf6381baVIrXT88+wJiirdcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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