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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11e060a54118c3cabd34ec26ccc3f9e45836acbd993d90b082b73103c231713' 
  AND token = 'OrggfRcoV5lCRHIrc54Euzez9el5kAAFM9RzObi0snw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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