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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53142625436828bcb751213c18d8dce70e5b82a26a09422155ac8a12b4190a7' 
  AND token = 'I7C8XFyu5Gd3fBI9ehUh2T2RpMDIWE58SSvczAPXlA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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