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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909ca456e1c0321b9bef592c2b22611a28d91d236e001cc3a1b843a2d6d2ebf6' 
  AND token = 'oO6ih/SvVMnDxXwJXZQwmF22IducXSLoymyNsRWDC6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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