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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a51dd98d91c7d4d6f514b6fb554ad445a1d6cf2c052470738dd76fb4aa168f' 
  AND token = '4f1UfbrF2M711lADqRZEm3nM82u6p4fl++VI0CJ+ft4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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