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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d6726593d6e81ee627d849beb71bfa82525a95269d60090af6e30599dd74b2' 
  AND token = '3B1hfBfoI1SM9dfBxDBATcjyC9Bs137eE5aFRkcz7KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00167

JSON explain

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