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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2ffe8d111c1fd26620e5db18ab65300707fb2dd89a332a17f632aa44963410' 
  AND token = 'NM0JFm77aoK+IjL0Vc/Fa8l71r4cEDD53YnjhANrnrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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