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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a081e8281af703200e084e6c0ff6fd0344371e96b9b86827453c6ff25db3e6' 
  AND token = 'KRE2yJw+eBnGQfcI9eESVuqtdbq+iP4rfMORJgCwlCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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