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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7105f3b21babeacad4571da35d3b7b4d38a6386af2b79db54f324d1d9c2b5c' 
  AND token = 'Vo+8Og2ZZNIb8CsoagX+3PkRAcrlra9D8s2FNXpi4LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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