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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceba50f5316e5c057f274a0ac9a746d861a36d2d666963e6836c812544130bac' 
  AND token = 'l+5QstG2eqLPa1hjiUqRDJ5gw9GM6HLNn0X/lh0HAso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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