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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc61cbaeba469d1f951ed4a2f6268e31c49c08ce2c73c0378a77eb7fe4f84421' 
  AND token = 'jCYYrrozy2wzkc8doOg9tO2eUgdRLDBfeRleztQCM6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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