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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c818f7735200701550ac6a54800d8e4875856bae82a50c4b25b4c77685289321' 
  AND token = 'CCCASIDFLUun+u8zWVsGOsDJ98BQGq8JTMSBMV/C+wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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