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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4d9e5c2753df030bd6dea440f4273558d72feb28437b79e26fb7d5add806be' 
  AND token = '48CCFv6AEilnfac5HkkS4EYDaDPa+7FAyGs7TkELdS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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