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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15b2656170589b0b7b93924ed3031929989965fc92bf6a856fcd2cc545996c3' 
  AND token = 'B079tegIgEzBLcO6SaSNDGCMcJqGiIDqA1+gv7i4H4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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