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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb86f3b59c08a2a12381e7af7417918d46dfc20e9724529661adc2615dbc4165' 
  AND token = 'BW/FiM+CxsQN7dBkfHNmOIvdr4SIdlX/q9VfwvxQHsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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