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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff0946905740ef76c55dfd9a985bdc3c099d34a3f790ab3e6f65c543bab9b1d' 
  AND token = 'VfCHziQS89KQ9ypPRPMtSs7HM+TLHLgt5x9lCGxVoHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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