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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add3965884053de53a51a0c72be93ce77d0db8b63034be706c1f10fd91056317' 
  AND token = 'P2IXvv5MLJXzcBC7zQki2FvJc/S0SpZdmwctIstZt24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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