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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b20ad0b367c2e879207a0ebf90f73802a4ded20b01bc4c497929b3cb9dfaf47' 
  AND token = 'hLILb/HjByIRY4+3KS9cWv8E4byZaPIu8gj/dGu2vPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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