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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017d3e1bd7de5184ce0de702773e39f06acf84de1820a4fed22bbd93cc41a97a' 
  AND token = 'g5zR111sD7ex49JoScupsO+i1uTaP3dh4fEXUiNShn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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