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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e778d9aa549ac64d8afd8fa1002b5e5f254bbf1acee487f5642af5e99bd799' 
  AND token = '4OyA75Q7QHcJ1uBJnCOPltqnqHTIYKeaD8WnNx8JKM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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