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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b97aff3ac8a423cb51846aeb2bda21cbd1a0a85ee90b2bec5dc857d88c6a0e' 
  AND token = '5gYhT/MLq8q4AhKjqrbn6Bm3FgSriaeHh9/C4e6QgX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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