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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba92a7dc5fa044bd026bbdddd4b5916ae0bac82f886bcdc81e8080b9d115d53c' 
  AND token = 'f5Hr8MTrQ9bpAihnvkLZp6s0lU+qmkhELQisiZao18w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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