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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e201c4ff14e0e22922223e4353c672da0d963406ea72cdcd2915a26ccb2cf39d' 
  AND token = 'PTheLji6IE0fIxO56dPPmXaXnvLzU9yUa6fi+aPSFIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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