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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c84958732ad9a412570c3c6b51696fff00a8ab458cdf71bfccf2ba27d8baa0b' 
  AND token = '0UFiy8aifh+zFVBcovDsiSS+183vsV1uYF9/S5oZQpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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