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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3b354819b89a62b6ba3c16ece21e59781923f95081a6afa2707c080d7e2354' 
  AND token = '1CzlU30NNbr+PUG0E2vc/TI2ZTMC9ks6OXC+0jnZPnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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