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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b2cdb23c2732f178b8e73f05fb6746336b765a25c32dc6bed80b15f4763a5e' 
  AND token = '7m5n0erVKaby+PHsORUZYDUs4/+b1RfJIbjae41Yi7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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