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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af328bf4025c5ea1bc3e1524c946cda3756fa45dce2831c1a1bedb024a72b93' 
  AND token = 'y+x6N7YGggE05S4cEwQfG+R4atxW8xCZtVNnA+8Yoec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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