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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ede57deb3a6c7859a419e0ac115c33be848e77462ec24a7c15a418789031e5' 
  AND token = '1imxFzAEEEMRkfpQdj5u3x8R6sXEp8l/53SQBMtcU/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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