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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a833e04cc9d6c945c8273e99710d7d5b6df7a672c435e794837ab7278e62a0' 
  AND token = 'A/jCjYmEe9O6D1t5EAWACCWpyw7eU1M880BppybvVLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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