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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0c3e420ce5ed55c99e250b6eb5aab0da139939d168dbc40fb4c59e44447c74' 
  AND token = 'RCIXd9XiwpLGp9K/WHiPHIWQ0uYSfP77040r3OQV6o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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