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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff710e67eac89f84df667705a87ae8896e7ed48709c6d71c6914da400a21c95' 
  AND token = '5rxVAsuKTSu+yMiiLgRaJU8EFosRRzzbAyXik6HzCQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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