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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8134d53efc1fb2702d47bc811e51c7195ad5151d67d1e6ae89732f9c7555880' 
  AND token = 'BnjkZ17t9+3y5FcltPZIqmX+FXiePMBpuY5SuAfP9rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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