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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7f32a966f8e0b3a2b195e400da3f1ec9391b55789ee6e126ec0b37d30f432f' 
  AND token = 't6bGfEdcSD3sRX8H9nSZj82mO3CP5MtJkHLuYjxDb/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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