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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39440ec62f2207455e4ce050679eca9bc63f514034d849e9e78f5852d1f464ab' 
  AND token = 'LvytOq2xpi5hDtNjNrI+w6bh1rjkbhW1cfFqo8NIysM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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