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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7562ef583711f29ee8fad2f3f115944dcb71c509b8bb902e806a8e461e2730a5' 
  AND token = 'f7iMr8tqQNe7ZUbLbITWtrSf51mA5DJbelHOzLNeoBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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