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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b46248b2d2f78012b7e57d116be6b71817ad239179780fa2e8ca6daeec852ec' 
  AND token = 'LBK0B6vLY+Pll8aTkgOSapXufmpBlS63TNf9dzrxO7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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