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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061eb31454271bfebed1950a23c49c51f4a11097f168c186c92ec385f5d08149' 
  AND token = 'ScWIzSvfr7DjDmW5fU/mRzJL/0Y896pTt2kxhmNglpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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