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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4e36e81784de64b533f61b49e6b6a7879a857c9ea469e19ad0b0b33e532e8a' 
  AND token = 'dgsIODcNcyB0Y656HiGVo/U422kKmXAmOyxkK5vJMDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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