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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92afd54727a291336b0357fc111c816c6aa697031389419a392551984218f98b' 
  AND token = 'FednpFxmIC0CO4lhu6XDetBen6cOs2S5TrVeh4KoyQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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