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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5623ab6a5e5d6a4168c12d7c6fa49d46ee77c96956aaba407c3447bdd7a301f9' 
  AND token = 'lcXjQLzNuf14iA9FVd2UZruHIsyzkiuAUrIUdfbOIyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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