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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176ba4967590b4d6ff319f6b8904aa7a0fc30b9c25e3959d68ec6fc4901aa6e4' 
  AND token = 'yFwthbXMElOY5Jvl/MdGoaGdlVaXmd1AlBeW0diEFWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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