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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b0bbe40b736d4c0cf8b6837b0cc3ac71650bb238a20b49a9576fa9a9b4e28d' 
  AND token = 'FDgoNOStNrYD8w5sF52oDGrin+QrlVLo8w6e1TmWcgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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