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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d2c217a3c957bd7904639030b5d8d5120afa7df1105e6baa823a2ff62d7c1a' 
  AND token = '/RJVSgM/Epsl5RsY8eqj4Zxf4Sca6JinC03BzDPkJJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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