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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ef9c70f53db6d306ee4a8da562e24b9ccb8092c5923630a5f5471680ce5073' 
  AND token = 'f668dHpnhx2WtpWiGtXWG6r2kb7TFyh84s+0mOBUID0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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