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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d667c632c81cd36dbbfba587a2ff913772470903de4fb6165f72a8bdbb907e' 
  AND token = 'Evin7u6V1viF1q+XPsN/cHDGGTTSjfExkb+qkPcXtAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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