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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec002ca93d9131cc376208aa36806aaca195d03fdea54b77d7e5d73591441154' 
  AND token = '6Il8q1QY5KoBqKa/ci/hI+6NGDTbASYpZub2CNJvtJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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