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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7170013afd46735297a8c7d180b0cb253d00a5924a7fb5eb870e146eb9f276a' 
  AND token = 'KPEZ0c79g1Z5IgJ/8mlRsgzaPX5iiz/blvUtAa/Ezkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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