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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd879c933a2800a0fada7f5aeea3227836a3c182fbbd0e60fe27b537d18ea5af' 
  AND token = 'Y02FMQKWqTL1CYPrKbfxKsK8AaQSrzs4Rg3BQj3RswA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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