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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3c679fa7212d1090a26a33fb14f20dfd8f7421f99af22d315c493a2cb76ac5' 
  AND token = '+7vFRaS91U7Dy0US772uXsmU+Dvn9YGZyGdgmUvRZlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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