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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da41fda768b4d80f493e3b8e9c2ae55b0049cd133c483459f3f53ca427ecc1ae' 
  AND token = '9WSue0Rfsk+MAJDOxYRoClq/TnvCzxPhyTz5/7XqdgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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