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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e312fa2702cfc280db178230c6adca59b0721bc4dadc0f5102b22a0d1661890d' 
  AND token = 'Nv/bYlFymNja09vSbDlygNSH/CAT/OErCzRuiF9yx8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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