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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0eddd287b2dea95b95fd238c6190a5fd40090ade2f7a04c0dfe1c62d9721c6' 
  AND token = 'a3+Rd+qKPS+stMdBw3wTtsW3GfEQA2Su9tGExLss1/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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