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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90f73746f7f8f4eabb3b3180b5b61b7bb5bfe13a1072c8eba2fc7eca4d70e63' 
  AND token = 'M9LZ1qU9Bjy63FJBuPVy/o50jA6hjUJ199oTdAu4sYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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