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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406d3380fc94c86d643686b0f97cf6a7207a33d6620959737d0811945e720590' 
  AND token = '07uUchwJt61nBSPMOLj8DaF3AmK3Rj+wHJWeayBx3bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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