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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd7ffb282ea0ebb4ceb80ebcb2dbc44e7249e24357fb5d5400c67cb493ee142' 
  AND token = 'KmU1r8u081iBd6vkDYCBM440Ldkc7Wtp+dvbkEeYP00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

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