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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff92b23584dbad6b69a8bfee6b74e7f7c404f870ec579c310e19919a7586084' 
  AND token = 'ik9ZCsdiCVMVm4//UcLSzlhp50wJAmWc1hRwAPg6k9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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