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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128709bd5ac964aa384b4cd657b73ed9a127393737f85323ea3e2df9da4c4289' 
  AND token = 'wT2JNT4v0M9peFod2NN75bEoWumTEinX4ViaXUL/Ivo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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