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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ee15c3f777345eede95e7a9ae5183a5ca686d03280d04055ec89f43df74538' 
  AND token = 'hSSnVClqO9Ed+77uYdUzJgaKE5jK8Eew63+1tIBU4g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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