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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f24ff8da65a255e5a60ab77ebfbff5bd04f8d1fdfcf0a5d1e5f875e8c64a33' 
  AND token = '7+zsye6HlloIVHILbSjN8uLBFpGG8sqStj3fQBn+aEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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